一階傾斜光纖光柵之量測與分析

Analysis of First Order Tilted Fiber Bragg Gratings

雷士慶(Shih-Cing Lei)

指導教授 ： 孫迺翔

義守大學/電機資訊學院/電機工程學系/碩士(2014年)

https://doi.org/10.6343/ISU.2014.00321

摘要

本篇論文主要是量測傾斜光纖光柵的傳輸、反射與輻射特性，本論文一開始先分析傾斜角度對光柵的影響，接著對不同材質的光纖製成的光柵作分析，最後是改變傾斜45˚光柵的曝光時間，針對這三種參數進行比較。SMF28製成的傾斜1˚光柵找到共振區，範圍約1539.6~1540.8nm，傳輸與反射有一階布拉格特性，傳輸最低效率為-31.57dB，反射最高效率為-0.3dB，輻射無波長選擇性，共振區外的輻射效率為-27.5dB，光柵材質換成PS1500之後，其他傾斜角度產生輻射，但隨著傾斜角度增加，有效光柵區縮短，共振區越不明顯，反射頻寬有增加的趨勢。PS1500製成的傾斜45˚光柵輻射效率較其他傾斜角度強，曝光時間3分鐘的輻射效率約為-11.03dB，共振區範圍約在1539.4~1540.4nm，傳輸效率最低為-34.68dB，反射最高效率-1.84dB，並與二階光柵比較兩者輻射的形式，前者是共振區外有較高輻射效率，後者是共振區內會有垂直輻射。最後利用紅外線攝影機與光束分析儀，分析光分布情形。

關鍵字

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並列摘要

In this paper, we measure the transmission, the reflection and the radiation spectrum of first-order titled fiber Bragg gratings (TFBGs). We change the parameters of titled fiber gratings to measure the characteristics of TFBGs, where these parameters include the titled angle, fiber material and exposure time. For the TFBGs made by SMF28 with tilted angle of 1˚, the resonance region is from 1539.6nm to 1540.8nm. The maximum reflection efficiency and minimum transmission efficiency are -0.3dB and -31.57dB, respectively, in the resonance region. The radiation has non-wavelength selective property. The radiation efficiency is -27.5dB out of the resonant region. The radiation efficiency of titled 45˚ TFBGs is bigger than the other TFBGs. The resonance region of tilted 45˚ FBGs with exposure time of 3 minutes ranges from 1539.4nm to 1540.4nm. The maximum reflection efficiency and minimum transmission efficiency are -1.84dB and -34.68dB, respectively, in the resonance region. Off resonance, the radiation efficiency is -11.03dB. We also discover an image of a near field intensity an 3D view of field pattern scans by using infrared camera an Beam profile.

並列關鍵字

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參考文獻

[1] K. O. Hill, Y. Fujii, D. C. Jonhson, and B. S. Kawasaki, “Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication,” Appl. Phys. Lett., vol.32, pp. 647-649, 1978.

[2] Kenneth. O. Hill and Gerald Meltz, “Fiber Bragg Grating Technology Fundamentals and Overview,” J. Lightwave Technol., vol. 15, No. 8, pp. 1263-1276, Auguset, 1997.

[3] B. F. Ventrudo, G. A. Rogers, G. S. Lick, D. Hargreaves, and T. N. Demayo, Electron. Lett. 30, 2147–2149,1994.

[4] A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. G. Askins, M. A. Putnam, and E. J. Friebele, J. Lightwave Technol. 15, 1442–1463 (1997).

[5] T. Erdogan, “Cladding-mod resonances in short- and long-period fiber grating filters,” J. Opt. Soc. Am A Vol. 14,pp. 1760-1773, 1996